/**
 * @license  Highcharts JS v6.1.0 (2018-04-13)
 * Streamgraph module
 *
 * (c) 2010-2017 Torstein Honsi
 *
 * License: www.highcharts.com/license
 */
'use strict';
(function (factory) {
	if (typeof module === 'object' && module.exports) {
		module.exports = factory;
	} else {
		factory(Highcharts);
	}
}(function (Highcharts) {
	(function (H) {
		/**
		 * Streamgraph module
		 *
		 * (c) 2010-2017 Torstein Honsi
		 *
		 * License: www.highcharts.com/license
		 */

		var seriesType = H.seriesType;

		/**
		 * A streamgraph is a type of stacked area graph which is displaced around a
		 * central axis, resulting in a flowing, organic shape.
		 *
		 * @extends {plotOptions.areaspline}
		 * @product highcharts highstock
		 * @sample {highcharts|highstock} highcharts/demo/streamgraph/
		 *         Streamgraph
		 * @since 6.0.0
		 * @optionparent plotOptions.streamgraph
		 */
		seriesType('streamgraph', 'areaspline', {
		    fillOpacity: 1,
		    lineWidth: 0,
		    marker: {
		        enabled: false
		    },
		    stacking: 'stream'
		// Prototype functions
		}, {
		    negStacks: false,

		    /**
		     * Modifier function for stream stacks. It simply moves the point up or down
		     * in order to center the full stack vertically.
		     */
		    streamStacker: function (pointExtremes, stack, i) {
		        // Y bottom value
		        pointExtremes[0] -= stack.total / 2;
		        // Y value
		        pointExtremes[1] -= stack.total / 2;

		        // Record the Y data for use when getting axis extremes
		        this.stackedYData[i] = pointExtremes;
		    }
		});


		/**
		 * A `streamgraph` series. If the [type](#series.streamgraph.type) option is not
		 * specified, it is inherited from [chart.type](#chart.type).
		 *
		 * @type {Object}
		 * @extends series,plotOptions.streamgraph
		 * @excluding dataParser,dataURL
		 * @product highcharts highstock
		 * @apioption series.streamgraph
		 */

		/**
		 * An array of data points for the series. For the `streamgraph` series type,
		 * points can be given in the following ways:
		 *
		 * 1.  An array of numerical values. In this case, the numerical values
		 * will be interpreted as `y` options. The `x` values will be automatically
		 * calculated, either starting at 0 and incremented by 1, or from `pointStart`
		 * and `pointInterval` given in the series options. If the axis has
		 * categories, these will be used. Example:
		 *
		 *  ```js
		 *  data: [0, 5, 3, 5]
		 *  ```
		 *
		 * 2.  An array of arrays with 2 values. In this case, the values correspond
		 * to `x,y`. If the first value is a string, it is applied as the name
		 * of the point, and the `x` value is inferred.
		 *
		 *  ```js
		 *     data: [
		 *         [0, 9],
		 *         [1, 7],
		 *         [2, 6]
		 *     ]
		 *  ```
		 *
		 * 3.  An array of objects with named values. The objects are point
		 * configuration objects as seen below. If the total number of data
		 * points exceeds the series' [turboThreshold](#series.area.turboThreshold),
		 * this option is not available.
		 *
		 *  ```js
		 *     data: [{
		 *         x: 1,
		 *         y: 9,
		 *         name: "Point2",
		 *         color: "#00FF00"
		 *     }, {
		 *         x: 1,
		 *         y: 6,
		 *         name: "Point1",
		 *         color: "#FF00FF"
		 *     }]
		 *  ```
		 *
		 * @type {Array<Object|Array|Number>}
		 * @extends series.line.data
		 * @sample {highcharts} highcharts/chart/reflow-true/
		 *         Numerical values
		 * @sample {highcharts} highcharts/series/data-array-of-arrays/
		 *         Arrays of numeric x and y
		 * @sample {highcharts} highcharts/series/data-array-of-arrays-datetime/
		 *         Arrays of datetime x and y
		 * @sample {highcharts} highcharts/series/data-array-of-name-value/
		 *         Arrays of point.name and y
		 * @sample {highcharts} highcharts/series/data-array-of-objects/
		 *         Config objects
		 * @product highcharts highstock
		 * @apioption series.streamgraph.data
		 */

	}(Highcharts));
}));
